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IXPE

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NORAD ID: 49954
Int'l Code: 2021-121A
Perigee: 550.9 km
Apogee: 561.5 km
Inclination: 0.2 °
Period: 95.6 minutes
Semi major axis: 6927 km
RCS: Unknown
Launch date: December 9, 2021
Source: United States (US)
Launch site: AIR FORCE EASTERN TEST RANGE (AFETR)
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NASA's NSSDC Master Catalog

Two Line Element Set (TLE):
1 49954U 21121A   25199.91668981  .00009922  00000-0  60517-3 0  9996
2 49954   0.2318 309.9388 0007676  92.2096 182.1855 15.05788008197662
Source of the keplerian elements: AFSPC